src/modules/m_httpd.cpp

   1 /*
   2  * InspIRCd -- Internet Relay Chat Daemon
   3  *
   4  *   Copyright (C) 2009 Daniel De Graaf <danieldg@inspircd.org>
   5  *   Copyright (C) 2007-2008 Robin Burchell <robin+git@viroteck.net>
   6  *   Copyright (C) 2008 Pippijn van Steenhoven <pip88nl@gmail.com>
   7  *   Copyright (C) 2006-2008 Craig Edwards <craigedwards@brainbox.cc>
   8  *   Copyright (C) 2007 John Brooks <john.brooks@dereferenced.net>
   9  *   Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
  10  *
  11  * This file is part of InspIRCd.  InspIRCd is free software: you can
  12  * redistribute it and/or modify it under the terms of the GNU General Public
  13  * License as published by the Free Software Foundation, version 2.
  14  *
  15  * This program is distributed in the hope that it will be useful, but WITHOUT
  16  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  17  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  18  * details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22  */
  23
  24
  25 #include "inspircd.h"
  26 #include "iohook.h"
  27 #include "modules/httpd.h"
  28
  29 class ModuleHttpServer;
  30
  31 static ModuleHttpServer* HttpModule;
  32 static bool claimed;
  33 static std::set<HttpServerSocket*> sockets;
  34
  35 /** HTTP socket states
  36  */
  37 enum HttpState
  38 {
  39         HTTP_SERVE_WAIT_REQUEST = 0, /* Waiting for a full request */
  40         HTTP_SERVE_RECV_POSTDATA = 1, /* Waiting to finish recieving POST data */
  41         HTTP_SERVE_SEND_DATA = 2 /* Sending response */
  42 };
  43
  44 /** A socket used for HTTP transport
  45  */
  46 class HttpServerSocket : public BufferedSocket
  47 {
  48         HttpState InternalState;
  49         std::string ip;
  50
  51         HTTPHeaders headers;
  52         std::string reqbuffer;
  53         std::string postdata;
  54         unsigned int postsize;
  55         std::string request_type;
  56         std::string uri;
  57         std::string http_version;
  58
  59  public:
  60         const time_t createtime;
  61
  62         HttpServerSocket(int newfd, const std::string& IP, ListenSocket* via, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server)
  63                 : BufferedSocket(newfd), ip(IP), postsize(0)
  64                 , createtime(ServerInstance->Time())
  65         {
  66                 InternalState = HTTP_SERVE_WAIT_REQUEST;
  67
  68                 FOREACH_MOD(OnHookIO, (this, via));
  69                 if (GetIOHook())
  70                         GetIOHook()->OnStreamSocketAccept(this, client, server);
  71         }
  72
  73         ~HttpServerSocket()
  74         {
  75                 sockets.erase(this);
  76         }
  77
  78         void OnError(BufferedSocketError) CXX11_OVERRIDE
  79         {
  80                 ServerInstance->GlobalCulls.AddItem(this);
  81         }
  82
  83         std::string Response(int response)
  84         {
  85                 switch (response)
  86                 {
  87                         case 100:
  88                                 return "CONTINUE";
  89                         case 101:
  90                                 return "SWITCHING PROTOCOLS";
  91                         case 200:
  92                                 return "OK";
  93                         case 201:
  94                                 return "CREATED";
  95                         case 202:
  96                                 return "ACCEPTED";
  97                         case 203:
  98                                 return "NON-AUTHORITATIVE INFORMATION";
  99                         case 204:
 100                                 return "NO CONTENT";
 101                         case 205:
 102                                 return "RESET CONTENT";
 103                         case 206:
 104                                 return "PARTIAL CONTENT";
 105                         case 300:
 106                                 return "MULTIPLE CHOICES";
 107                         case 301:
 108                                 return "MOVED PERMENANTLY";
 109                         case 302:
 110                                 return "FOUND";
 111                         case 303:
 112                                 return "SEE OTHER";
 113                         case 304:
 114                                 return "NOT MODIFIED";
 115                         case 305:
 116                                 return "USE PROXY";
 117                         case 307:
 118                                 return "TEMPORARY REDIRECT";
 119                         case 400:
 120                                 return "BAD REQUEST";
 121                         case 401:
 122                                 return "UNAUTHORIZED";
 123                         case 402:
 124                                 return "PAYMENT REQUIRED";
 125                         case 403:
 126                                 return "FORBIDDEN";
 127                         case 404:
 128                                 return "NOT FOUND";
 129                         case 405:
 130                                 return "METHOD NOT ALLOWED";
 131                         case 406:
 132                                 return "NOT ACCEPTABLE";
 133                         case 407:
 134                                 return "PROXY AUTHENTICATION REQUIRED";
 135                         case 408:
 136                                 return "REQUEST TIMEOUT";
 137                         case 409:
 138                                 return "CONFLICT";
 139                         case 410:
 140                                 return "GONE";
 141                         case 411:
 142                                 return "LENGTH REQUIRED";
 143                         case 412:
 144                                 return "PRECONDITION FAILED";
 145                         case 413:
 146                                 return "REQUEST ENTITY TOO LARGE";
 147                         case 414:
 148                                 return "REQUEST-URI TOO LONG";
 149                         case 415:
 150                                 return "UNSUPPORTED MEDIA TYPE";
 151                         case 416:
 152                                 return "REQUESTED RANGE NOT SATISFIABLE";
 153                         case 417:
 154                                 return "EXPECTATION FAILED";
 155                         case 500:
 156                                 return "INTERNAL SERVER ERROR";
 157                         case 501:
 158                                 return "NOT IMPLEMENTED";
 159                         case 502:
 160                                 return "BAD GATEWAY";
 161                         case 503:
 162                                 return "SERVICE UNAVAILABLE";
 163                         case 504:
 164                                 return "GATEWAY TIMEOUT";
 165                         case 505:
 166                                 return "HTTP VERSION NOT SUPPORTED";
 167                         default:
 168                                 return "WTF";
 169                         break;
 170
 171                 }
 172         }
 173
 174         void SendHTTPError(int response)
 175         {
 176                 HTTPHeaders empty;
 177                 std::string data = "<html><head></head><body>Server error "+ConvToStr(response)+": "+Response(response)+"<br>"+
 178                                    "<small>Powered by <a href='http://www.inspircd.org'>InspIRCd</a></small></body></html>";
 179
 180                 SendHeaders(data.length(), response, empty);
 181                 WriteData(data);
 182         }
 183
 184         void SendHeaders(unsigned long size, int response, HTTPHeaders &rheaders)
 185         {
 186
 187                 WriteData(http_version + " "+ConvToStr(response)+" "+Response(response)+"\r\n");
 188
 189                 time_t local = ServerInstance->Time();
 190                 struct tm *timeinfo = gmtime(&local);
 191                 char *date = asctime(timeinfo);
 192                 date[strlen(date) - 1] = '\0';
 193                 rheaders.CreateHeader("Date", date);
 194
 195                 rheaders.CreateHeader("Server", BRANCH);
 196                 rheaders.SetHeader("Content-Length", ConvToStr(size));
 197
 198                 if (size)
 199                         rheaders.CreateHeader("Content-Type", "text/html");
 200                 else
 201                         rheaders.RemoveHeader("Content-Type");
 202
 203                 /* Supporting Connection: keep-alive causes a whole world of hurt syncronizing timeouts,
 204                  * so remove it, its not essential for what we need.
 205                  */
 206                 rheaders.SetHeader("Connection", "Close");
 207
 208                 WriteData(rheaders.GetFormattedHeaders());
 209                 WriteData("\r\n");
 210         }
 211
 212         void OnDataReady()
 213         {
 214                 if (InternalState == HTTP_SERVE_RECV_POSTDATA)
 215                 {
 216                         postdata.append(recvq);
 217                         if (postdata.length() >= postsize)
 218                                 ServeData();
 219                 }
 220                 else
 221                 {
 222                         reqbuffer.append(recvq);
 223
 224                         if (reqbuffer.length() >= 8192)
 225                         {
 226                                 ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "m_httpd dropped connection due to an oversized request buffer");
 227                                 reqbuffer.clear();
 228                                 SetError("Buffer");
 229                         }
 230
 231                         if (InternalState == HTTP_SERVE_WAIT_REQUEST)
 232                                 CheckRequestBuffer();
 233                 }
 234         }
 235
 236         void CheckRequestBuffer()
 237         {
 238                 std::string::size_type reqend = reqbuffer.find("\r\n\r\n");
 239                 if (reqend == std::string::npos)
 240                         return;
 241
 242                 // We have the headers; parse them all
 243                 std::string::size_type hbegin = 0, hend;
 244                 while ((hend = reqbuffer.find("\r\n", hbegin)) != std::string::npos)
 245                 {
 246                         if (hbegin == hend)
 247                                 break;
 248
 249                         if (request_type.empty())
 250                         {
 251                                 std::istringstream cheader(std::string(reqbuffer, hbegin, hend - hbegin));
 252                                 cheader >> request_type;
 253                                 cheader >> uri;
 254                                 cheader >> http_version;
 255
 256                                 if (request_type.empty() || uri.empty() || http_version.empty())
 257                                 {
 258                                         SendHTTPError(400);
 259                                         return;
 260                                 }
 261
 262                                 hbegin = hend + 2;
 263                                 continue;
 264                         }
 265
 266                         std::string cheader = reqbuffer.substr(hbegin, hend - hbegin);
 267
 268                         std::string::size_type fieldsep = cheader.find(':');
 269                         if ((fieldsep == std::string::npos) || (fieldsep == 0) || (fieldsep == cheader.length() - 1))
 270                         {
 271                                 SendHTTPError(400);
 272                                 return;
 273                         }
 274
 275                         headers.SetHeader(cheader.substr(0, fieldsep), cheader.substr(fieldsep + 2));
 276
 277                         hbegin = hend + 2;
 278                 }
 279
 280                 reqbuffer.erase(0, reqend + 4);
 281
 282                 std::transform(request_type.begin(), request_type.end(), request_type.begin(), ::toupper);
 283                 std::transform(http_version.begin(), http_version.end(), http_version.begin(), ::toupper);
 284
 285                 if ((http_version != "HTTP/1.1") && (http_version != "HTTP/1.0"))
 286                 {
 287                         SendHTTPError(505);
 288                         return;
 289                 }
 290
 291                 if (headers.IsSet("Content-Length") && (postsize = ConvToInt(headers.GetHeader("Content-Length"))) > 0)
 292                 {
 293                         InternalState = HTTP_SERVE_RECV_POSTDATA;
 294
 295                         if (reqbuffer.length() >= postsize)
 296                         {
 297                                 postdata = reqbuffer.substr(0, postsize);
 298                                 reqbuffer.erase(0, postsize);
 299                         }
 300                         else if (!reqbuffer.empty())
 301                         {
 302                                 postdata = reqbuffer;
 303                                 reqbuffer.clear();
 304                         }
 305
 306                         if (postdata.length() >= postsize)
 307                                 ServeData();
 308
 309                         return;
 310                 }
 311
 312                 ServeData();
 313         }
 314
 315         void ServeData()
 316         {
 317                 InternalState = HTTP_SERVE_SEND_DATA;
 318
 319                 claimed = false;
 320                 HTTPRequest acl((Module*)HttpModule, "httpd_acl", request_type, uri, &headers, this, ip, postdata);
 321                 acl.Send();
 322                 if (!claimed)
 323                 {
 324                         HTTPRequest url((Module*)HttpModule, "httpd_url", request_type, uri, &headers, this, ip, postdata);
 325                         url.Send();
 326                         if (!claimed)
 327                         {
 328                                 SendHTTPError(404);
 329                         }
 330                 }
 331         }
 332
 333         void Page(std::stringstream* n, int response, HTTPHeaders *hheaders)
 334         {
 335                 SendHeaders(n->str().length(), response, *hheaders);
 336                 WriteData(n->str());
 337         }
 338 };
 339
 340 class HTTPdAPIImpl : public HTTPdAPIBase
 341 {
 342  public:
 343         HTTPdAPIImpl(Module* parent)
 344                 : HTTPdAPIBase(parent)
 345         {
 346         }
 347
 348         void SendResponse(HTTPDocumentResponse& resp) CXX11_OVERRIDE
 349         {
 350                 claimed = true;
 351                 resp.src.sock->Page(resp.document, resp.responsecode, &resp.headers);
 352         }
 353 };
 354
 355 class ModuleHttpServer : public Module
 356 {
 357         std::vector<HttpServerSocket *> httpsocks;
 358         HTTPdAPIImpl APIImpl;
 359         unsigned int timeoutsec;
 360
 361  public:
 362         ModuleHttpServer()
 363                 : APIImpl(this)
 364         {
 365         }
 366
 367         void init() CXX11_OVERRIDE
 368         {
 369                 HttpModule = this;
 370         }
 371
 372         void ReadConfig(ConfigStatus& status) CXX11_OVERRIDE
 373         {
 374                 ConfigTag* tag = ServerInstance->Config->ConfValue("httpd");
 375                 timeoutsec = tag->getInt("timeout");
 376         }
 377
 378         ModResult OnAcceptConnection(int nfd, ListenSocket* from, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server) CXX11_OVERRIDE
 379         {
 380                 if (from->bind_tag->getString("type") != "httpd")
 381                         return MOD_RES_PASSTHRU;
 382                 int port;
 383                 std::string incomingip;
 384                 irc::sockets::satoap(*client, incomingip, port);
 385                 sockets.insert(new HttpServerSocket(nfd, incomingip, from, client, server));
 386                 return MOD_RES_ALLOW;
 387         }
 388
 389         void OnBackgroundTimer(time_t curtime) CXX11_OVERRIDE
 390         {
 391                 if (!timeoutsec)
 392                         return;
 393
 394                 time_t oldest_allowed = curtime - timeoutsec;
 395                 for (std::set<HttpServerSocket*>::const_iterator i = sockets.begin(); i != sockets.end(); )
 396                 {
 397                         HttpServerSocket* sock = *i;
 398                         ++i;
 399                         if (sock->createtime < oldest_allowed)
 400                         {
 401                                 sock->cull();
 402                                 delete sock;
 403                         }
 404                 }
 405         }
 406
 407         CullResult cull() CXX11_OVERRIDE
 408         {
 409                 std::set<HttpServerSocket*> local;
 410                 local.swap(sockets);
 411                 for (std::set<HttpServerSocket*>::const_iterator i = local.begin(); i != local.end(); ++i)
 412                 {
 413                         HttpServerSocket* sock = *i;
 414                         sock->cull();
 415                         delete sock;
 416                 }
 417                 return Module::cull();
 418         }
 419
 420         Version GetVersion() CXX11_OVERRIDE
 421         {
 422                 return Version("Provides HTTP serving facilities to modules", VF_VENDOR);
 423         }
 424 };
 425
 426 MODULE_INIT(ModuleHttpServer)